US2683871A - Electrical signal device mounting and installation - Google Patents

Description

July 13, 1954 A. MELESKI 2,683,871

ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION Filed Aug. 8, 1951 3 Sheets-Sheet l a 26 l6 22 30 5b W01 5/: /6 9 ./6 l6 July 13, 1954 A. MELESKI 2,683,871

ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION Filed Aug. 8, 1951 3 Sheets-Sheet 2 QZ2"9.7. 7? k8 gil f 9 a? i 3/ 9L JL 1 79 793/ 5;

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20 n n 7 2 68 35 23! 17 1 E A. L. MELESKI ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION 3 Sheets-Sheet 3 Filed 1951 IVZZM W Patented July 13, 1954 UNlTED TENT OFFICE ELECTRICAL SIGNAL DEVICE MOUNTING AND INSTALLATION Anthony L. Meleski, New York, N. Y., assignor to Edwards Company, Inc., Nor-walk, Conn, a corporation of New York 19 Claims. 1

This invention relates to signaling devices, par ticularly electrical signaling devices such as electric gongs, bells, and the like, and more particularly to the housing, mounting, and installation of electric signaling devices.

This application is a continuation-in-part of my application Serial No. 142,430, filed February 1-, 1950, now abandoned.

One of the objects of this invention is to provide housing and mounting means for such devices suitable for either indoors or outdoors. Another object is to provide a housing construction for electric signaling devices, particularly of the audible type, that will have ready adaptability and that will also have good adaptability for meeting various requirements for installation or mounting in practical use.

Another object is to provide a support for signaling devices of the above-mentioned character a mounting means therefor which can be embodied in simple, economical, and compact structural form and which may be readily assembled and mounted.

Another object is to provide a construction of the above-mentioned character which will provide a wide range of adaptability of installation in relation to various types of wiring systems with which the electric signaling device is to be associated, while at the same time retaining the advantages of ease, simplicity, and dependability of assembly. Another object is to carry out this last-mentioned object with structural features embodying relatively few parts and so interrelated as to achieve practical foolproofness in carryin on and completing any given installation.

Another object is to provide an inexpensive and practical housing and signalin device assembly which will be capable of economical manufacture and ease of assembly, and constructed and arranged to coact with a mounting means therefor insure ease and dependability of installation and, in its preferred form, to be capable also of wide adaptability to various mounting and wiring requirements. More particularly, another object is to provide a signalin device assembly and mounting of the just-mentioned character to carry a gong or the like or other sound-emitting device externally and electrical actuating mechanism therefor internally, embodying structural features facilitating assembly and setting thereof in relation to each other and includin in the mounting means dependable provision for insuring installation without detrimental impairment of the signal actuation and action.

Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combination of elements, and arrangement of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which are shown two illustrative embodiments each having adaptability to various types of installation and w ring systems and in which similar reference characters refer to similar parts throughout.

Figure 1 is a central vertical sectional view of one illustrative form of signaling device support or housing assembled to its mounting plate and illustratively thereby mounted on a wall to illustrate a surface-mounted installation;

Figure 2 is a rear elevation of the mounting plate as seen from the right in Figure 1, with the mounting plate partly broken away and being shown disassembled from the rest of the mechanism;

Figure 3 is a rear elevation of the device as seen from the right in Figure 1 with the mounting plate and the insulating separator plate removed, showin in elevation certain features of the assembly, to form a subunit, of the signaling device and its housing-like support;

Figure 4 is an elevation as seen along the line 4 4 of Figure 1 showin certain relationships between a connector element of the mounting plate subassembly and the signaling device subassembly, that relationship being also embodied in other forms shown in the drawings as indicated by the line i4 of Figure '7 and also of Figure 9;

Figure 5 is a fragmentary horizontal sectional view through the assembled signaling device subassembly and mounting plate subassembly of Figure 1, showing them secured to or mounted on a special form of outlet box;

Figure 6 is a fragmentary horizontal sectional view as seen along the line 6-5 of Figure 3 showin certain preferred structural features where the signal-actuating means utilizes a permanent magnet;

Figure '7 is a central vertical sectional view, on a somewhat smaller scale, of a modified form of signa1-actuating mechanism and housin subassembly coacting with a modified form of mounting plate, all shown in Figure 7 as secured, illustratively, to a wall surface as in a surfacemounted installation;

Figure 8 is an elevation as seen along the line 88 of Figure l, partly broken away, showing more particularly the mounting plate subassembly and certain structural features of coaction thereof with the housing subassembly;

Figure 9 is a detached fragmentary horizontal sectional view as seen along the line 9-9 of Figure 3.

Figure 10 is an elevation as seen from the right in Figure '7 of the signaling device and housing subasscmbly as it is seen detached from the mounting plate subassembly and with the insulating separator plate removed, being also partly insection;

Figure 11 is a fragmentary sectional view as seen along the line Iili of Figure 10 showing certain structural features of assembly where the electric signal-actuating means embodies a permanent magnet, and,

Figure 12 is a vertical sectional view like that of Figure 7 but on an enlarged scale, showing the assembled signaling subassembly and mounting plate subassembly in coacting relationship with a special form of outlet box.

Referring first to Figures 1 and 3, the electric signaling device, for purposes of illustration of certain features of my invention, comprises an electromagnetic winding l which is to be connected to an electric circuit and which forms part of a signal-actuating mechanism which is to be suitably mounted and supported in the desired location and which preferably forms part of a subassembly of which another part comprises a main support which is preferably constructed in the form of a housing generally indicated by the reference character it and Within which the electrical actuating mechanism is mounted and secured. In the illustrative embodiment the signaling device is of the audible type such as a bell and in such case it is provided with a gong I! which is preferably and conveniently mounted externally of the housing l6. As is better shown in Figure 1, the housing I6, which is somewhat dome-shaped, has a sub-- stantial portion thereof extending into and enveloped by the end or peripheral portions of the gong which may be secured to the housing as by a cap screw I8 provided with a suitable spring lock washer i9 threaded into a suitably reinforced portion of the housing It. The latter, as appears also from Figure 3, is generally circular in section and in the illustration the gong I1 is mounted coaxially with the housing IS.

The signal device and its support or housing, assembled in the form of a subassembly as is later described, are to be mounted to a suitable support such as the vertical face of a wall, either directly thereto, as to the wall W in Figure l where the circuit wiring may be so-called exposed surface wiring, or to the usual type of outlet box usually recessed in a wall where the wiring may be of the concealed or conduit type, or for outdoor or weatherproof mounting in sealed relation to a coacting outlet box provided with weatherproof conduit or like wiring. To facilitate such mounting, of which the just mentioned illustrate a variety of requirements to be met, a mounting plate generally indicated by the reference character 26 (Fi ures 1 and 2) is provided, constructed and coacting as later described. For many installations, particularly for outdoor use and where the signaling device comprises an externally-mounted gong as in Figure 1, it is preferable that the gong striker part of the internally-mounted electric actuating mechanism have access to the gong through a lowermost portion of the housing and, as better shown in Figdislodgement from their holes.

ures 1 and 3, I provide an aperture ifi in the wall of the housing I6 itself and through the aperture I6 the gong striker 2| is actuatable to impact the gong H. For this and other advantages I also make provision, as is later described, to insure that the housing and signaling subasseinbly are assembled to the mounting plate consistently in the desired relationship.

The housing 16 which is desirably die-cast, While substantially dome-shaped, is stepped, its side wall having a plurality of setbacks; thus it has a plurality of substantially cylindrical wall portions 6 [6, and It of successively different diameters joined by intermediate or laterallyextending annular wall portions IG and l6 the planes of which are conveniently substantially at right angles to the axis of the housing. A similar lateral portion Iii joins portion li to the end partially-spherical portion I6 The portions 16, IB and H5 form transverse flange-like ledges and are adapted to coact with other parts as later described.

The portion 16 (Figure 1) is of appropriate radial extent externally to be provided with diametrically-opposed holes 22 and 23 and to accommodate the heads of screws 2 and 25, respectively, which extend through the holes and are held against movement out of the holes by split rings 26 and 2'1, respectively; the screws 24 and 25 are thus held assembled to the housing While being freely rotatable relative thereto and their threaded shanks extend rearwardly (to the right in Figure 1) to an extent less than the axial extent of the housing portion l6. The threaded ends of the screw thus terminate well within the plane of the rear end of the housing and, if desired, they may be provided with reduced-diametered end portions for ease of entry into diametrically-opposed threaded holes and 20* (see Figure 2) of the mounting plate 28. The casing portion IB also forms an annular seat for a cushioning and scaling gasket ring 36 preferably made of rubber and of substantial thickness, and coacting to hold the ring 30 in place is the casing portion [6 against which the ring 39 peripherally engages. Ring 39 is provided with diametricallyopposed apertures through which the screws 24 and pass. These apertures may be made smaller than the pitch diameter of the threaded shanks of the screws so that the ring 35, even though it fits snugly within the cylindrical casing portion 16 is thereby held against dislodgement from its seat, and this arrangement may also be used to hold the screws 2 and 25 against These features are of advantage with or without the split rings 26 and 21 in maintaining assemblage of these parts during handling and packaging as well as during installation and attachment to the mounting plate.

The mounting plate 20, which may be a stamping but is preferably of die-cast construction, is disc-like or circular and is of a maximum diameter somewhat less than the internal diameter a of the end casing portion it (Figure 1), and adjacent its periphery and projecting out of its plane the plate 20 is provided with an annular flange 3| which in its preferred form is V-shaped in cross section as is shown in full lines in Figure 5 and in broken lines in Figure 1. In horizontal or axial dimension as seen in Figures 1 and 5 the casing end flange or portion l6 and the mounting plate flange 3| are about the same so that with the annular apex of the V-shaped flange 3i resting against the rubber ring 30 and the screws 2 t and 25 threaded into the mounting plate holes 23* and 29 the yieldable ring 30 may be compressed to the desired extent before the end edge of casing portion 16 reaches the plane of the rear face of the mounting plate 26 as the two parts are telescoped together under the tightening action of the two screws. Adequate compression of the ring 39 is thus always assured even though mounting plate 253 may rest flush against a wall face or the like. The screw holes 25 and 26 of the mounting plate 26 (Figure 2), in the illustrative embodiment, pass through the of the V-shaped flange 3i and preferably the latter is provided with bosses 25 and 25 which fill in the trough on the rear side of the V-shaped flange at the selected diametricallyopposed points so as to provide greater axial length and more metal for the screw holes and ,2 8

Between the transverse or flange-like casing portions it and [5 (Figure l) the inner surface of the cylindrical wall portion it is internally stepped or rabbetted circumferentially as at Mi (Figures 1 and 3) and at spaced intervals therealong is provided a plurality of bosses 33 (Figure 3), illustratively three in number, provided with threaded holes d receive screws 3 3. In the step or rabbet i t is seated a disc-like insulating plate 3? (Figure 1) and it is held in place by the screws E i. Plate 3i closes off the interior of the casing it and covers over the apparatus and mechanism mounted therein, as about to be described; the separator plate 3's serves also to exclude dust and the like from the interior of the housing and to prevent installation wires associated with the mounting plate 2%, as is later described, from contacting the electric signal-actuating mechanism contained within the housing It; it also shields the signaling mechanism during handling or installation of the housing and signaling subassembly.

In its preferred form the separator plate 3? also coacts with the mounting plate subassembly to insure the desired orientation of the former relative to the latter, upon installation. For this purpose I preferably provide the mounting plate with an aperture 3'. (Figures 1 and 4) which is off-center and radially displaced from the center of the disc-like plate 31. Aperture 3%, as is better shown in Figure 1, is adapted to just receive therein. the foremost or front end portion of a socket or receptacle 38 that is 01": any suitable construction, usually made of insulating material, and provided with sockets Bil and 33 for the disconnectibl reception of two contact prongs; these sockets and 38* are in the front or lefthand end face, as seen in rigure l, or" the re ceptacle part and, through the aperture 31", are thus presented to the interior of the housing it. The receptacle part 38 is secured to the front face or" the mounting plate 2e as by screws "E5 (Figure l) th eaded into it and passing through suitable holes in the mounting plate 139 and countersunk in the rear faces thereof (Figures 1 and 2). Like the aperture 3? in the separator plate 3i, receptacle part st, in securing it to the mounting plate 29, is similarly oif-center radiall" displaced from the center of the mounting plate. lllustratively and as shown in Figures 1 and 2, aperture 3? is off-center along the diame er along which the screws 25 and 25 are diametrically opposed, and the receptacle part 38 is similarly oil-center but along the diameter along which screw holes 28 and 2t of the mounting plate 2e are aligned.

Accordingly, with the housing is and mounting plate 29 circular in the described embodiments, the aperture 33* in the separator plate 3'. and the forwardly projecting part of the receptacle member 38 prevent, during assembly, such relative rotary displacementbetween the casing it and the mounting plate 20 as would misalign the diametrically-opposed screws in the one end screw holes in the other and thus entry of the screws into their respective holes in the mounting plate is greatly expedited, virtually eliminating the need for manual exploration during installation. This action is aided by the coaction oi the frusto-conical face of the outer portion of the V- shaped flange 3! with the peripheral flange porticn ifi of the casing id in achieving concentricity of interrelationship of the two parts as the one is assembled to the other; these actions are of ner advantage where, as is usually the case, the mounting plate 29 is fastened in position at a substantial height from the floor. Of coasting aid in these actions are also the two contact prongs l and al of a plug connector element ti which is mounted within the casing H5 in a position to project the plug prongs through "the aperture 3i in the separator plate so that as the casing subassembly and the mounting plate subassembly are brought together as above described, the plug prongs li ll enter the recesses or sockets 38 of the receptacle part 38 carried by the mounting plate 26. The plug member s! may be of any suitable construction and usually com prises a body of insulating material from which the plug prongs project and having suitable connectine devices such as metal tabs 51 and ti (Figure 3) to which external electrical connection is made to the plug prongs. In the illustrative embodiment the plug member 3! is mounted in position as shown in Figures 1 and 3, juxtaposed to the aperture 33 in the separator plate 3?, by means of two spaced bosses A2 and 43 formed or cast integrally with the interior wall of the casing it, forming in elfect extensions of the internal annular ledge formed by the casing portion its; the plug member at rests against the aligned faces of these parts and is secured thereto by screws t l (Figure 3). The plug prongs ll ii thus project through the separator plate aperture 31* but they terminate short of the plane of the inner otherwise open end of the casing it, being thus protected during handling, packaging, and the like by those portions of the casing ncluding the end portion it that extend rearwardly beyond the plane of the separator plate 3?. To the connector tabs ll 4i (Figure 3) are connected the conductors s5 that lead to the electric signaling mechanism, to the electromagnetic winding E5 in the illustrative embodiment.

The receptacle part 33 forming part of the mounting plate subassembly is provided with binding posts to which the heavier circuit conductors of the wiring system are connected, and these binding posts preferably take the form of a pair of screws 46 respectively accommodated in the front faces of wing-like lateral extensions 3& and 38 (Figure 2) of the main body part of plug receptacle member 33, these wing-like extensions being of lesser dimension than the main body part of the receptacle as is bet-t r shown in Figure 1. In any suitable manner the binding screws 43 are internally in electrical connection with the internal contacts with which the plug prongs ll M engage when they are entered into the sockets 38 38 The mounting plate 29 is provided with a central round hole 20 (Figures 1 and 2) through which the circuit conductors are passed when the mounting plate subassembly is secured in position; in Figure 1 conductor 41 of the system or circuit wiring are shown passed through the hole 25 and they are connected respectively to the binding screws 45 of the receptacle part 38; this is done when the mounting plate 20 is secured in position, it being noted that the binding screws are conveniently exposed at the front face of the mounting plate for ease of electrical connection. The mounting plate 20 is constructed to meet a wide range of installation or wiring requirements or standards. For example, it is provided with a goodly number of appropriately distributed holes or slots 20 (Figure 2) so located that the plate 20 may be secured directly, as a closure plate, to any of the standard 01' like outlet boxes whether surface-mounted or recessed in the wall or flush-mounted in the wall; the holes are preferably so located that the circular mounting plate 29 is substantially centered to such an outlet box, thus insuring free and easy passage of the circuit conductors 41 from the box through the mounting plate aperture 29 whence they are connected to the binding screws 46.

Also, the mounting plate subassembly is constructed so that it may be installed on a wall surface for use in connection with so-called exposed surface wiring and in such case provision is made to mount it in spaced relation from the face of the wall W as shown in Figure 1. Preferably the mounting plate 29] is provided with holes 26 (Figure 2); these holes 20 may be distributed in any suitable manner and preferably they are three in number and disposed in triangular relation. At each hole is secured, to the rear face of the mounting plate 25, so as to form a part of the mounting plate subassembly, an annular stud or spacer 48. The spacers 48 are secured coaxially with their respective holes 26 so that screws 49 (Figure 2) may be passed through the holes and spacers and threaded into the wall W, thus securing the mounting plate subassembly to the wall with suflicient space therebetween to accommodate the surface wiring and to extend the circuit to the aperture 251 for the passage of the conductors 47 to the front side of mounting plate 20 for connection to the plug receptacle binding screws 46.

Preferably the spacing studs 48 are secured to the plate 20 in a manner to permit them to be readily removed; illustratively, and as shown in Figure 1, I may employ a bushing 50 like an eyelet which has one portion press-fitted into the hollow spacer 48 and another portion spun or expanded, initially or during assembly, over the front face of the plate 29 about the hole 20 The screws 49 pass through the bushing 50 as well as through the spacer 48, as shown in Figure 1, and where the bushing is made of a soft metal like soft brass or copper, it has a further advantage of yielding under the tension of the screw head and forming a good securing seat thereagainst for the screw. Part 50 may also be made of a non-metallic material, like fibre. Where the spacer members 48 are not needed, as for example when the installation is to be made directly to a usual or standard outlet box as above described or to the outlet box about to be described, the annular spacers are simply knocked off, the securing bushing or eyelet 5B readily yielding for this purpose.

Furthermore, the mounting plate subassembly is also constructed to coact to achieve a sealed installation, as for example for certain types of outdoor uses or installations or other locations where it is desired or necessary to seal the housing to an outlet box. One such illustrative embodiment is shown in Figure 5 in which is shown an outlet box 52 having a base or back wall 53 and a cylindrical side wall 54 of a diameter commensurate with that of the end casing portion IS the box 52 may be of cast construction and in its side wall it has one or more threaded holes 54 to receive a pipe or conduit through which the circuit conductors are led into the box. Box 52 is secured to its support in any suitable manner, preferably weatherproof; for example, it may be fastened on the face of a wall or recess in a wall and it may be provided with suitable holes 53 in its back wall to receive securing screws 55 which are provided with sealing washers 56, which may be of fiber.

The front edge face of the cylindrical wall 54 is rabbeted as shown in Figure 5 to provide a forwardly projecting annular rib 54 whose diameter closely approximates the diameter of the outer frusto-conical part 31* of the V-shaped rib and to provide an annular seat or face 53 that substantially matches the end annular face of the end portion I6 of the housing It. A sealing washer 51 made of any suitable yieldable material, preferably and illustratively of rubber and having a crosssection preferably like that shown in Figure 5, is interposed between the parts [5 and 3i and the ribbed or rabbeted annular end face of the outlet box side wall 54. As shown, the gasket ring 51 has an annular recess into which the annular rib 54 snugly fits; this has the advantage of permitting ease of attachment of the gasket ring 5'! to the periphery of the outlet box in that the interfitting of the ring with the rib 54 achieves a gripping of the latter by the yieldability or resiliency of the ring itself and accordingly the workman, after installation of the outlet box 52 itself and before assembling the mounting plate subassembly thereto, simply seats the gasket ring 51 against the outlet box periphery,

- interfitting the two parts as just described,

whence the rubber ring remains in position and is ready to receive the mounting plate thereagainst.

The mounting plate subassembly comprising the mounting plate 20 with the spacer elements 48 removed therefrom as above described and with the plug receptacle 38 forming a part thereof is now seated against the gasket ring 51 after bringing the circuit conductors through the apcrture 26 in the mounting plate, whereupon the relatively heavy flange portion 57 of the gasket ring serves in effect to center the mounting plate 20 relative to the round outlet box 52 in that the outer wall 3| of the V-shaped flange is just receivable within the heavy rubber flange 5'? whence the mounting plate subassembly is secured to the outlet box by screws 58 that pass through suitable holes in the plate 25 and are threaded into internal bosses or pillars 55 pro vided internally of the box 52 and preferably cast integrally therewith. The screws and pillars; are preferably three in number, the holes in plate 2 1! for screws 58 are preferably the abo e-- described holes 20* from which the spacer elements 48 have been removed, and the pillars 68 are correspondingly located, illustratively at the apex of a triangle. The screws 58 are sufficiently tightened up to effect suitable compression of the portion of the gasket ring 57 that intervenes the part 3H of the V-shaped flange 3! and the front face of the rib 54 The circuit conductors are then connected to the binding screws 46, 46 of the plug receptacle.

The casing and signaling mechanism subassembly now assembled to the installed mounting plate subassembly in the manner above described connection with Figure l, but now the end annular o the casing portion I 6 is brought 1 nst the rib-like portion 57 the go e so that upon tightening the screws 2s the gasket ring 30 and the outer heavy portion of the gasket ring 51 are compressed to efiect sealing. The former is compressed between the convex annular apex of the V-shaped flange 3a and the casing wall portion it and the latter is compressed between the end. f; ce casing portion 16 and the face of the bot 544 the latter action complementing the compression of the intermediate portion oi gasket ring 57 between the flange part 3! a and i "ted when the mounting was secured to the outlet box. 1 any such .nstallations various of the coting feat res oi construction above described 1e to make certain that the signal- :1 associated with the housing i6 lee in inverted position, and in the embodiments the housing opening 1) through which the striker 2| acgcng i? will always be in lowermost position which is of advantage in a erproof installation or which might be jita or desirable because of the char- Jics of the electric actuating mechanism. n the mechanism shown in Figures 1 and 3, the

. 1 the casing 15.

cunit comprises a base plate 63 of nonterial sum as brass, shaped as ine narrower or restricted portion l d casing 56, preferably to an extent shown in Figure 1, the plane of its face coincides with the plane in the inial eo c of casing i6; plate 63 has lateral b B (Figure 3) which overlie to which plate 63 is secured by eby into bosses 65 formed in the the casing ledge portion l6 to non of the casing wall portion l6 holes Because of the increased ness of the ledge W, the lateral plate excne 63 553 are joined to the plate 63 ri at led bends 53 and 63 as is better trative embodiments the signal-achanisrn comprises the winding l above men oned and coacting therewith a permai? t et PM the fluxes of both of which con rol the movement of the plunger "nanent magnet PM is iilustratively in the form or" a rectangular a suitable alloy such as Alnico nagnetized to high and permait is desirably mounted'and sein a manner by which machincicci; can be avoided and preferably by means that coact with the mounting of the a1- the plate 53 thereof in the well or restri ted portion of the casing i6. As shown in Figure 3 and also in Figure 6, the permanent magnet PM rests with its bottom face against the plate 63 and with a portion of its right-hand side face against the right-angled bend or flange 63 by the extension 63* of which the plate 53 is secured by screws 5% to the casing it. The plate 63 is cut away centrally and in rectangular shape, as at 63 Figure 3, to provide a recess or aperture through which a portion the solenoid winding 5 with its end insulating discs or plates 66 can project and at one end of the opening 83 to provide also one or more upstanding ears or lugs 63", as shown in Figure to engage against the opposite side of the permanent magnet PM, as is indicated also in Figure 6.

The block-like permanent magnet PM is en gaged at its opposite ends by end plates ti 6% which are provided with right-angled lugs or cars ill that rest flatwise' against the base plate 63 to which they are secured by screws ll, thus holding the magnet block PM against shifting in up-and-down direction as viewed in Figures 1 and 3. Plates 6? and 63 are provided with bentover ears or lugs 61 and 68 which overlie the top face of the magnet block PM and thus hold it against movement away from the base plate 33.

End plates 5? and 63 are made of steel or other suitable paramagnetic material and form extension poles for the permanent magnet PM to a flux gap within which is the winding id, as better appears in Figure 1, so that the permanent magnet flux and that of the winding is can coact along the axis of the solenoid winding within the channel or bore of which, and subjected to the coacting fluxes, is the plunger The latter is suitably mounted and guided for reciprocation, by means of a tube 72 of non-magnetic material, preferably brass. This tube passes through the bore of Winding i5 and through suitable apertures in the insulating end plates '36, t3 and is carried by the paramagnetic end plates 6?, 68 which are coaxially apertured to receive the brass tube 72 with a press-fit, with the tube extending to both sides of the thus assembled winding and pole extensions. In the upper end of guide tube '12 is a coiled spring it one end of which abuts against the plunger E32 and the other end of which abuts against a bent" up flange 63 of the base plate $3, flange 33 also fixing the position of the guide tube l2 relative to the remaining parts. If desired, flange $3 and tube l2 may be secured together in any suitable way, as by soldering, though axial displacement press-fit thereof in the pole plates 6i and E3 and in the heavy insulating plates 55, St. The conductors 5, 35 (Figures 1 and 3) are connected to the terminals of the winding it at the underside of the base plate 63, thus completing the signal-actuating subunit, ready for assembly to the casing 26.

The bottom aperture it (Figures 1 2), in the casing portion ic is oi a diameter to receive the free end of guide tube '52 and is of sub tantial axial extent, made so by thickening the casing wall portion it" by casting a boss integrally with as is clearly shown in Figures 1 and 3. The signaling unit is let down into the casing, the conductors 65, 55 are secured or soldered to the connecting tabs G5 and il or" the connector block iii, and the unit is then slid along the porting ledges in the casing so as to enter the free end of guide tube '52 in the long round hole inserted through the slots 63 $3 and into the threaded holes in the casing ledge and they are tightened up, preferably after testing the mechanism in its action upon the gong H, by energizing the winding I with alternating current of, for example, 60 cycles, thus to achieve the optimum setting of the parts. The plunger 62 is reciprocable to move its upper end as seen in Figure 1 toward and away from the permanent magnet pole extension 6? while its lower end portion, during reciprocation, remains within the aperture of the other pole piece 58 for radial flux flow therebetween. The flux of the permanent magnet, when winding I5 is de-energized, exerts an upward pull on the core or plunger 62 tending to lessen the axial flux gap between the upper end of the plunger and the extension pole 6'1, against the action of spring 13 which may thereby be somewhat compressed, and thus the striker 2! is held by the flux of the permanent magnet in withdrawn position and out of contact with the gong i1.

When winding 55 is energized by pulsating or alternating current, the flux of the solenoid winding [5 aids or opposes that of the permanent magnet PM and in coaction with the spring 13 effects synchronous reciprocation of the core and striker 2 l. The resultant action is powerful, so much so that it is of advantage to maintain the line of reciprocation of the plunger 62 substantially vertical, thus also lessening the effects of friction and wear; the above-described features of assembly of the signaling mechanism and housing as one subunit to the mounting plate subunit insure the achievement of such vertical relationship of plunger actuation in a thoroughly dependable, practical, and foolproof manner.

In Figures 7 to 12 I have shown a modified form of construction and embodying also additional features of construction and coaction, particularly adaptable for signaling constructions and installations of larger size and power than are above described, and in Figures 7 to 12 the same reference characters are used as are employed in connection with Figures 1 to 6 to indi cate like or similar parts, excepting that the housing in Figures 7 to 12 is generally indicated by the reference character IF, the mounting plate by the reference character and the signaling mechanism base plate by the reference character 83*. As will be clear from the applied reference characters, the various portions of housing 5* correspond generally with those described in connection with Figures 1 to 6, excepting that where the wall portion Hi of housing 16 of Figure 1 is cylindrical throughout, in the modified form and as is better shown in Figures 7 and 10 the wall portion I6 is arcuate at its upper and lower ends and is parallel-sided along chords of its circle, as is better shown in Figure 10 more compactly to accommodate the illustrative signal-actuating mechanism there employed. The base plate of the latter is generally rectangular (Figure 10) and can rest directly upon the internal ledge formed by the transverse wall portion I6 to which it is adjustably secured by screws 64 extending through slots 63 and E3 and threaded into bosses 65 that provide a suitable mass of metal to accommodate the screws without penetrating the casing wall. By shaping the wall l5 of the casing 16* as just described, I am enabled to simplify the construction of the base plate 63*, eliminating the right-angled bends and extensions 63 ---63 and 63'=-B3 of Figure 3, and I am also enabled to simplify the positioning and securing of the permanent magnet PM. As in the earlier form described, the permanent magnet PM rests with its bottom face against the plate 63 which is cut away or apertured as at B3 to provide one or more lugs 63* bent upwardly as seen in Figure 10 (see also Figure 11) to engage one side of the magnet block, and the latter is held down against the plate 63* by lugs 61 and 68 of the paramagnetic end plates 6! and 68 which in this form also overlie and hold down edgewise against the base plate 63 companion pole extension plates 61 and 68 the latter being in effect duplicates of pole extension plates 6'1 and 68 but without the lugs and ears in order to provide a greater cross-section for carrying the flux of the permanent magnet as better appears from Figures 7 and 12. At the right-hand side face of the permanent magnet PM (Figure 10) the base plate 63 need not be supplied with any upstanding flange or lug and, instead, I utilize the adjacent housing wall I6 to hold the magnet block against dislodgement in a direc tion to the right as viewed in Figure 10, and for this purpose the inside face of wall IE is provided with a boss Hi which presents a small magnetengaging face parallel to the base plate slots 53, 63 and so spaced from the line of adjustment permitted by the slots and screws that the righthand edge of base plate 83* and the right-hand face of magnet block PM engage the face of boss As is better shown in Figures '7 and 12, the signal mechanism may be embodied in larger and more powerful form than that of Figures 1 and 3, and in order to gain certain other advantages the upper pole extension plates 6? and iii are provided with an annular paramagnetic sleeve 75 for flux conduction and to provide an internal axial flux gap between the lower end of sleeve i5 and the lower pole extension plates 68 and G8", the sleeve '15 surrounding the plunger guide tube 12. With this construction and arrangement of parts it is preferred not to press-fit the guide tube '12, though it serves to align the parts 6?, 15, 66, and 68 with the end supporting plates 6i and 88 by which it and they are supported, the guide tube [2 passing through the apertures in each. Its free end is or" sufficient length to pass into the housing wall aperture Hi and as viewed in Figures '7 and 12 its upper end is spun or flanged over, as at 2 to abut against the pole plate 6? to hold it against downward movement, and it is held against upward axial movement by the base plate flange (53 which in this form is bent up out of some of the material of base plate 63 that is removed to provide the rectangular aper ture 63 in which part of the solenoid winding i5 is accommodated. As in the form of Figure l, the bent-up flange 53 forms an abutment for one end of the spring I3, but since in the form of Figures '7, l0 and 12 the spring can be shorter, there is interposed between flange 63 and the end of the spring 13 a plug 16 of paramagnetic material.

The signal-actuating mechanism, assembled as a unit, is easily assembled to the housing It, being simply set down into the restricted or welllike portion of the housing to bring the base plate 63 to rest on the above-described ledges and other extensions, bringing the parallel slots 63 and 63 into alignment with the screw holes for screws 64 and bringing the right-hand face of permanent magnet block PM, as seen in Figure 10, alongside of the housing boss 16 the plunger guide tube I2 is entered into the bottom hole th of the housing by simply sliding the signaling unit to the desired extent whereupon the screws are inserted and tightened up, thus fixing the position of the mechanism and confining the permanent magnet block against movement to the right or left as viewed in Figure between the bent-up base plate lugs 63 and the housing boss 53 The conductors that lead from the winding are connected, as before, to the tabs of the plug connector All which in the form of Figures 7 to 12 is also radially displaced, preferably along a vertical diameter but below the center of latter, as is shown in Figures 7 and 12, being secured as before by screws (as, 44 threaded. into bosses c2 and 43 similarly oiiset below the center, as distinguished from the offsetting radially above the center as in Figures 1 and 3. Corrcspondingly the insulating separator 3? (Figures 7 and 12) has its aperture 31 similarly displaced downwardly from the center so that the plug prongs #l i l 1* project therethrough.

The companion receptacle connector part instead of being secured to the mounting plate above the center as in Figures 1 and 2, is secured below the center as is better shown in Figures d l to locate it appropriately for coaction the similarly downwardly displaced aper- El in the separator plate 3i and with the prongs that project therethrough.

in the first form described, the mounting is provided with suitably distributed n or holes by which it may be secured on ct boxes in any suitable or usual form, and three triangularly disposed holes 29 achable spacer elements 43 where it is to be spaced from a wall surface, as shown gure 7, and with suitable holes which may e holes 2t with the spacers 4 8 knocked oil eiving screws 5 to secure it to a special 11 of outlet box 52*, in Figure 12, for weatherinstallation, the box 52 being shown "al cross-section in Figure 12 and being genr the same as the box 52 of Figure 5, e'-' cept- 12E" is larger and is of modified construcits eriphery for modified coaction with 1 zounting plate subassembly 20 The mounting plate 28 (Figures '7, 8, and 12) may be in the form of a stamping oi suitably vy sheet metal and, as in the earlier form, provided with a V-shaped flange 31 whose or x apex coacts with the cushioning and sealing which, as before, is seated against "inc-r face or ledge formed by the housing ion and is encompassed by the end housportion 6 with which the frusto-conical 35 of the ii-shaped flange 3! may coact by ing the two parts into concentric relation the housing subassembly is secured to the installed mounting plate subassembly "Bisthe upper end of its vertical diameter as red in Figures '7, 8, and 12, the mounting plate a tongue ll projecting upwardly and the largest circumference of the V-shaped 1 3i, clearly shown in these figures, it be formed by bending a portion of the outer frusto-conical part 3% out of the plane of latter and along a line so as not to interrupt or city or" the convex apex of flange 3! a h rests against the ring 39. As is better shown in Figures 7, 10, and 12, the casing end porticn m provided with an arcuate slot ill at e upper of its vertical diameter and into ich t mounting plate tongue 11 enters to an extent which is limited by a lug '29 (see Figures 8 and 9) which is pressed out of the metal of the tongue il and is adapted to engage the inner face of the wall portion it as is better shown in Figures 7 and 12.

Accordingly, with the mounting plate subassembly 26* installed and with the circuit conductors brought through the aperture HF and connected to the receptacle member 38, the signaling mechanism and housing iS subassembly is assembled thereto by first letting the housing downwardly, as viewed in Figures 7, 10, and 12, relative to the mounting ure-2w, while holding the lower portion of the housing assembly canted to the left as viewed in Figures '7 and 12, thus permitting the tongue 11 to enter the housing slot to an extent limited by the lug E9 on the tongue; the lower housing portion is then pressed inwardly, or toward the right, thus subiecting the upper arcuate reaches of the yieldable ring at to compression as that inward swinging movement of the housing brings the ledge face seat of ring 30 closer to the convex apex of the V-shaped flange 3| and thus also bringing the screw 25 carried by the housing IS near the lower end of its vertical diameter, into registry with the threaded hole 89 provided in the suitably broadened or deformed portion of the apex of the V-shaped flange 3 as is clearly shown in Figures '7, 8, and 12. The stop lug 19 on the mounting plate tongue 71 acts as a locator to position the housing IG at the right height to bring the screw 25 and the threaded hole 29 into registry. The screw 25* may now be tightened up, thus directly compressing the lower arcuate reaches of the ring 30 and further compressing the upper arouate reaches thereof by the resultant leverage action where the tongue i7 acts like one end of a lever and the right-hand wall of slot 78 (Figures 7 and 12) acts like a fulcrum.

ihus effective sealirr action may be achieved and in an outdoor or weatherproof installation, as in Figure 12, sealed connection to the outlet box 52* is achieved by a gasket 8! of rubber or the like constructed to coact with the \'-shaped flange 3! of the mounting plate 29* and with an annular or ring shaped rib 5 similar to the rib 54 of Figure 5 but positioned in the end edge face of the circular box wall 54 so as to provide annular ledges or seats 54 and 56 to either side of the rib 54 the latter, moreover, is of a mean diameter about the same as the diameter of the apex of the V-shaped plate flange 3!. The gasket 81 is molded to give it an annular recess 8P into which the box rib enters and is seated, the resiliency of the side wall portions of this recess 81 acting to grip the rib t l to hold the gasket 5! assembled to the wall box peripl ery just prior to securing the mounting plate assembly iiito the outlet box. The inountiplate Zil therefore need only be brought over the gasket 8!, with its tongue El uppermost and the connector receptacle 33 lowermost, the internal V-shape of the rib 3i neatly seating itself over and against the companion V-shaped portion of the gasket Si and thus in effect virtually centering the mounting plate subassembly it relative to the box 52 and thereby aiding aligning the screw holes in the two for reception of the securing screws 58. With the three screws 58 tightened up, the gasket 3! is cornpressed throughout its circular extent and as the screws 58 lessen the spacing between the internal apex of the V-shaped flange SI and the box rib 54 the rib 54 coacts with the two slan ing or frusto-conical wall portions of the V- shaped flange 3| to press the rubber of the ring 8| against these frusto-conical surfaces, thus achieving dependable sea-ling in addition to the compression of other portions of the gasket ring 8i against other portions of the two parts and 54. With the mounting plate 20* thus assembled to the box 52*, the housing subassembly EE is then assembled thereto in the manner above described and, as with the embodiment of Figures l to 5, sealing is effected on both sides of the mounting plate.

In the two illustrative forms shown in the drawings (Figures 5 and 12) the gaskets 51 and 3t serve the same purpose of providing a seal between an outlet box and the mounting plate supported thereon and each cooperates with the gasket 39 which is between the mounting plate and the laterally extending step or flange ii? of the housing, to provide an installation well adapted for use for out of doors. Moreover, as .rown in the drawings, these parts coact with each other to facilitate assembly of the parts during installation and make for ease and facility of dependable installation; as shown in Figures 5 and 12, the outlet boxes engage the respective gaskets 5i and a: at the front or forward ends of the annular parts or side walls 55 of the outlet boxes, the different shapes of the two gaskets providing in gasket 5'! a shoulder or flange 5'! fitting up around the outside of the V-shaped flange 3! of the mounting plate 28 (Figure 5) while gasket 8! is adapted to flt into the groove or trough formed at the periphery of the mounting plate 20* (Figure 12) by the mutually inclined portions that form the V-shaped flange 3 i.

It will thus be seen that there has been provided by this invention an apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiments above set forth, it is to be understood that all matter hereinbefore set forth 1 or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. Signaling device mounting means comprising a circular mounting plate adapted to be secured to a support at the rear side thereof and having a V-shaped peripheral flange with the apex of the V-shaped flange exposed forwardly of the plate, and a housing of circular cross section having one end open for coaction with said mounting plate and having successive portions of lesser diameter so that it is stepped providing a plurality of setbacks including a plurality of laterally and substantially radially extending wall portions separating wall portions of different diameter extending substantially at right angles to said laterally extending portions, an annular ledge on the inner face of a wall portion intermediate adjacent laterally extending wall portions, and a disk-like separator plate adapted to be received within said housing and to rest against said annular ledge to close off a portion of the interior of said housing from a portion of the interior adjacent the open end thereof, with electro-responsive means within said closed-off portion of the housing, and means for detachably securing said separator plate to said annular ledge, the laterally extending wall portion nearest the open end of the housing being juxtaposed to the apex of said V-shaped flange of said mounting plate with the endmost wall portion of the housing which extends from said last-mentioned laterally extending portion encompassing the said flange on the said mounting plate, and means carried by said last-mentioned laterally extending wall portion of the housing and by said mounting plate respectively for interengaging said housing and said mounting plate.

2. Signaling device mounting means comprising a mounting plate and means for attaching said mounting plate to a support surface, said mounting plate having screw receiving bore means adjacent its periphery which project forwardly of the plane of the plate, and a housing having an open end for coaction with said plate and which is stepped from said open end providing a plurality of setbacks of decreasing cross section in a direction toward the other end of said housing and providing a laterally extending annular wall portion substantially parallel with the support surface on which the device is supported and spaced therefrom by a distance commensurate with the extent of forward projection of said screw-receiving bore means or the mounting plate, said mounting plate being receivable within the open end of said housing with said screw-receiving bore means substantially juxtaposed to said lateral annular wall portion which has extending through it threaded screw means of a length to terminate on the inside of the plane of said open end and adapted to register with the said forwardly projecting bore means adjacent the periphery of said mounting plate for attaching said housing to said mounting plate.

3. The device as claimed in claim 2 provided with a separable plug and socket combination of which one member has means mounting it within said closed-off portion of the housing and adjacent said separator plate and is in electrical connection with said electro-responsive means and the other has means mounting it on said mounting plate in a position adjacent to and directed toward said separator plate, said mounting plate having aperture means for the passage therethrough of circuit conductors whereby the latter may be connected to said other member, said separator plate having a portion cut away to form aperture means to permit coacting assembly of said two members upon assembly of said housing to said mounting plate and to permit separation between said two members upon disassembly of said housing from said mounting plate.

4. The device as claimed in claim 2 in which the mounting plate has a V-shaped annular flange with the apex directed forwardly of the general plane of the plate for entry into the housing in juxtaposition to said lateral annular wall portion, said V-shaped flange projecting in said direction from a substantially flat central portion which is provided with a number of difierent apertures adapted for attachment to any of a number of known wall outlet boxes.

5. The device as claimed in claim 2 in which the mounting plate has a V-shaped annular flange with the apex directed forwardly of the general plane of the plate for entry into the housing in juxtaposition to said lateral annular wall portion, said V-shaped flange projecting in said direction from a substantially flat central portion which is provided with a number of different apertures adapted for attachment to any of a number of known wall outlet boxes, the aforesaid screw receiving bore means in the periphery of said mounting plate being located in said V- shaped flange substantially along the bisector of the V of the flange.

6. A device of the kind described comprising a housing having an open end which is internally stepped to provide a plurality of internal side wall seats facing toward its open end, a separator plate peripherally seated against one of said seats intermediate of the ends of said housingand relatively adjacent but spaced from said open end to divide the interior of the housing into a'relatively shallow portion at said open end of the housing and a relatively deeper portion on othed side of the separator plate, signalling means comprising electro responsive means in said deeper portion of the housing and having frame means engaging with and secured to internal step seats of the housing, a mounting plate adapted to be secured to a support and having aperture means for the passage therethrough of conductors, said mounting plate having secured thereto one member of a plug and socket combination, said member being adapted for connection thereto of said conductors and projecting into said shallow portion of the housing upon assembly of the housing to the mounting plate, said housing having secured therein exposed toward said open end thereof the other member of said plug and socket combination which is connected to said electroresponsive means, and means comprising the open end portion of the housing and an internal seat adjacent thereto for interfitting and securing together said mounting plate and the housing with said companion members of said plug and socket combination mutually aimed for coacting assembly of one to the other as the housing is interfitted with and secured to the mounting plate.

7. A housing for an electrically operated signal device comprising a housing having an open end and having electro-responsive means mounted and secured therein together with one member of a plug and socket combination, said member being in electrical connection with said electro-responsive means and exposed toward said open end of the housing, said housing having adjacent its open end an internal seat peripherally surrounded by a flange-like end portion of the housing, a gasket of yieldable material seated against said seat and within said flange-like end portion of the housing, a mounting plate adapted to be secured to a support and having aperture means for the passage therethrough of conductors, said mounting plate being receivable within said flange-like end portion and against said gasket, and means for drawing and securing the housing and mounting plate together to place said gasket under compression, said mounting plate having secured thereto the other member of said plug and socket combination in a position juxtaposed to said first-mentioned member for coacting assembly of the plug prong contact means and the socket contact means thereof in response to movement of assembly of the housing to the mounting plate and continued approaching movement therebetween as said gasket is placed under compression.

8. The device claimed in claim 7 in which said means for drawingand securingthe housing, and mounting plate together comprises a lateral slot in the flange-like end portion of the housing, said slot being located between the end edge of the latter and the gasket seated against said seat, a laterally projecting tongue on the mounting plate receivable into said slot and which must first be entered therein before said plate is receivable within said flange-like end portion of the housing and which is entered therein in response to initial relative lateral movement between the housing and the mounting plate and thereby also locate the latter over said gasket, said tongue and slot thereafter serving as a fulcrum for relative pivotingmovement to enter the mounting plate completely within said flange-like end portion of the housing and thereby lock said tongue and slot against disengagement, and threaded means perioherally displaced from said slot and tongue for pivotally drawing plate and housing together about said fulcrum as an axis and by the resultant leverage action placing said gasket under compression.

9. The device claimed, in claim 7 in which the means for drawing andsecuring the housing and mounting plate together to place the gasket under compression comprises screw means operable from the exterior of the housing and passing through said internal gasket seat and through the gasket itself to coact in holding the gasket assembled to said seat prior to assembly of the housing to the mounting plate and threaded hole means in the mounting plate for receiving said screw means upon reception of the mounting plate within said flange-like end portion of the housing and against said gasket.

10. A mounting for a signal device operating means comprising a cup-like casing and a mounting plate, said plate having a threaded hole adjacent its periphery and, said casing having an annular rim adapted to receive therein and extend around said mounting plate, said annular rim of the casing being spaced from and joined to the remainder of the casing by an inwardly and laterally extending flange, the said flange having a screw hole which may be brought into register with said threaded hole adjacent the periphery of said mounting plate to receive a screw for joining the casing to the mounting plate, the said casing having a slot extending radially through its said annular rim and peripherally spaced from said screw hole, and said mounting plate having a radially extending tongue and similarly peripherally spaced from said threaded hole and adapted to enter said slot whereby to rotatively orient the casing and the plate and to orient the screw hole of the former with the threaded hole of the latter, and a lug on the said tongue positioned to limit the extent to which said tongue can be inserted through said slot and to thereby position the said casing in radial direction relative to said mounting plate so that the screw hole in the said flange in the casing is in register with the said screw hole in the mounting plate.

11. A signal device housing comprising a mounting plate having holes for the passage therethrough of mounting screws, means for mounting the mounting plate on a support comprising hollow spacers at the back of the plate for resting against the support, said spacers being attached to the plate for easy removability by cylindrical parts that extend coaxially into the screw holes in the plate and are shouldered at the ends thereof adjacent the front face of the mounting plate and are deformable for ease of detachment ofthe spacers where spaced mounting of the plate is not desired, mounting screws passed from the frontof saidplate throughsaid holes andcylindrical parts and hollow spacers with their headed ends at said shouldered ends and their threaded ends entered into the support to clamp the plate and hollow spacers between the support and their head ends, said mounting plate being thereby mesa mounted in spaced relation from the support to provide space for the passage of conductors therebetween and having aperture means for the passage therethrough of conductors from said space to the front side of the mounting plate, and a casing having therein electro-responsive means in electrical connection with said conductors passed through said aperture means, said casing and said mounting plate having means for securing them together with the casing substantially closing over the front of said mounting plate.

12. A closure and mounting for the operating means of an electric signal device comprising a casing and mounting plate assembly, electric signal-operating means within said casing, said casing having a peripheral seat at one end for receiving peripheral portions of said mounting plate to substantially align the latter with the casing, said mounting plate having means for the passage therethrough of conductive means leading to said signal-operating means, a gasket in said seat, the peripheral portion of said mounting plate having a substantially V-shaped cross-section with the apex of the latter engaging said gasket and with the V-shaped trough-like portion thereof facing away from said casing and toward the support to which said mounting plate is to be secured, a gasket extending throughout said V-shaped trough-like portion and thereby interposed between the mounting plate and the support, and means for securing said casing and mounting plate together and to a support to place said gaskets under compression.

13. A signal device mounting including a housing having therein electro-responsive means, a mounting plate having means for the passage therethrough of circuit conductors and having holes to receive mounting screws from the front side thereof, means for securing the housing to and at the front of the mounting plate, annular spacer studs on the back face of said mounting plate in alignment with said mounting holes respectively with means detachably securing the studs to the mounting plate comprising easily deformable bushings extending into the holes in the mounting plate and into said annular studs respectively, whereby mounting screws may be passed through the bushings and spacers to secure the mounting plate in spaced relation from a support and whereby said annular spacer studs may be easily removed from the mounting plate where mounting of the latter in spaced relation is not desired.

14. A closure and mounting for the operating means of an electric signal device comprising a casing open at its rear end, an outlet box open at its front end, and a mounting plate interposed therebetween, said outlet box having at its open end means forming a substantially peripheral seat for a gasket and a gasket seated thereat, said mounting plate having means for the passage therethrough of conductive means leading from said outlet box into said casing, said casing having a peripheral seat at its said rear end with a gasket seated thereagainst and said mounting plate having a peripheral portion of substantially V-shaped cross-section with the apex of the latter directed toward said casing with said apex engaging said second-mentioned gasket, said first-mentioned gasket and said outlet box seat therefor having coacting peripheral extents to juxtaposition the gasket to a peripherally continuous part of the rear side of said V-shaped peripheral portion of the mounting plate; and means for securing said casing, mounting plate, and outlet box together with said gaskets under compression.

15. A construction as claimed in claim 14 in which said casing is provided with a peripheral flange-like portion that substantially envelopes laterally said V-shaped portion of the mounting plate to bypass it in a direction toward the mounting plate and that extends into direct engagement with said first-mentioned gasket to form a seal therewith.

16. A construction as claimed in claim 14 in which said V-shaped peripheral portion of the mounting plate is formed by two substantially frusto-conical wall portions presenting a V- shaped trough facing toward said outlet box, said peripherally continuous part comprising at least one of said frusto-conical portions for engaging and resting against said first-mentioned gasket.

17. A construction as claimed in claim 14 in which said V-shaped peripheral portion of the mounting plate is formed by two substantially frusto-conical wall portions presenting a V- shaped trough facing toward said outlet box, said peripherally continuous part comprising at least one of said frusto-conical portions for engaging and resting against said first-mentioned gasket and said casing having an end peripheral wall portion substantially enveloping the outermost of said frusto-conical portions of the wall plate and terminating in engagement with said first-mentioned gasket.

18. A construction as claimed in claim 14 in which said V-shaped peripheral portion of the mounting plate is formed by two substantially frusto-conical wall portions presenting a V- shaped trough facing toward said outlet box, said peripherally continuous part comprising both of said frusto-conical portions of the mounting plate for engaging against said first-mentioned gasket.

19. A construction as claimed in claim 14 in which said V-shaped peripheral portion of the mounting plate is formed by two substantially frusto-conical Wall portions presenting a V- shaped trough facing toward said outlet box, said first-mentioned gasket having a portion that is externally V-shaped and received in said trough between the frusto-conical portions of the mounting plate to coact in centering the box relative to the mounting plate during assembly, said peripherally continuous part comprising both of the inside faces of said trough.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,486,896 Hubbell Mar. 18, 1924 1,603,884 Van Amberg Oct. 19, 1926 1,665,802 Symmes Apr. 10, 1928 1,673,213 Sukumlyn June 12, 1928 2,105,573 Wilson Jan, 18, 1938 2,117,064 Ketay May '10, 1938 2,273,688 Bolz et al Feb. 17, 1942

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